diff toys/pending/strings.c @ 1324:3191aa9490aa draft

strings - print the strings in the file.
author Ashwini Sharma <ak.ashwini1981@gmail.com>
date Thu, 29 May 2014 08:18:50 -0500
parents
children bf2e5591bdf0
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line diff
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/toys/pending/strings.c	Thu May 29 08:18:50 2014 -0500
@@ -0,0 +1,66 @@
+/*strings.c - print the strings of printable characters in files.
+ *
+ * Copyright 2014 Kyung-su Kim <kaspyx@gmail.com>
+ * Copyright 2014 Kyungwan Han <asura321@gmail.com>
+ *
+ * No Standard
+
+USE_STRINGS(NEWTOY(strings, "n#=4<1fo", TOYFLAG_USR|TOYFLAG_BIN))
+
+config STRINGS
+  bool "strings"
+  default n
+  help
+    usage: strings [-fo] [-n count] [FILE] ...
+
+    Display printable strings in a binary file
+
+    -f Precede strings with filenames
+    -n [LEN] At least LEN characters form a string (default 4)
+    -o Precede strings with decimal offsets
+*/
+#define FOR_strings
+#include "toys.h"
+
+GLOBALS(
+  long num;
+)
+
+void do_strings(int fd, char *filename)
+{
+  int nread, i, wlen, count = 0;
+  off_t offset = 0;
+  char *string;
+
+  string = xzalloc(TT.num + 1);
+  wlen = TT.num - 1;
+
+  while ((nread = read(fd,toybuf,sizeof(toybuf)))>0 ) {
+    for (i = 0; i < nread; i++, offset++) {
+      if (((toybuf[i] >= 32) && (toybuf[i] <= 126)) || (toybuf[i] == '\t')) {
+        if (count > wlen) xputc(toybuf[i]);
+        else {
+          string[count] = toybuf[i];
+          if (count == wlen) {
+            if (toys.optflags & FLAG_f) xprintf("%s: ", filename);
+            if (toys.optflags & FLAG_o)
+              xprintf("%7lld ",(long long)(offset - wlen));
+            xprintf("%s",string);
+          }
+          count++;
+        }
+      } else {
+        if (count > wlen) xputc('\n');
+        count = 0;
+      }
+    }
+  }
+  xclose(fd);
+  free(string);
+}
+
+void strings_main(void)
+{
+  loopfiles(toys.optargs,  do_strings);
+}
+